tetra-
/ˈtetrə/(元音前亦作tetr-)
combining form
1
- four; having four表示“四”：
tetramerous
tetragram
tetrode.
2
- Chemistry (in names of compounds) containing four atoms or groups of a specified kind【化】［用于复合词中］表示“四元”, “四甲”：
tetracycline.